For large cichlids I would mount return flow at one end of the tank and the uptake at the other end.
I like to mount the spraybar or return nozzle much like byron suggest's but i don't aim it to hit glass first but rather mount it high on the end of the tank directing the flow slightly upwards to create rippling effect.
Have expierimented with my planted tank, and for me and the plant's and fishes I keep, Mounting the spray bar or return nozzle in middle of tank against the back glass so that flow hits the front glass, and travels down and then across the substrate and back up the back glass works best.I can sprinkle fish food and watch it reach both corner's of the tank which asures me that nutrient's are also reaching these area's and that there are no dead area's.
I mount the uptake/intake to the filter, at one end or the other on back glass.
Course the way I have it for the plant's is much different than the first way . First way ensures that majority of waste is delivered to the other end where uptake is located.
Second way seems to collect debri at the back of the tank but that's OK for I have plant's to utilize it.